Acidic Blood. When the hydra takes piercing or slashing damage, each creature within 5 feet of the hydra takes 9 (2d8) acid damage.
Hold Breath. The hydra can hold its breath for 1 hour.
Multiple Heads. The hydra has six heads. While it has more than one head, the hydra has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, or knocked unconscious. Whenever the hydra takes 45 or more damage in a single turn, one of its heads dies. If all its heads die, the hydra dies. At the end of its turn, it grows two heads for each of its heads that died since its last turn, unless it has taken fire damage since its last turn. The hydra regains 20 hit points for each head regrown in this way.
Reactive Heads. For each head the hydra has beyond one, it gets an extra reaction that can be used only for opportunity attacks.
Wakeful. While the hydra sleeps, at least one of its heads is awake.
Creature Sense The neothelid is aware of the presence of creatures within 1 mile of it that have an Intelligence score of 4 or higher. It knows the distance and direction to each creature, as well as each creature’s Intelligence score, but can’t sense anything else about it. A creature protected by a mind blank spell, a nondetection spell, or similar magic can’t be perceived in this manner.
Innate Spellcasting (Psionics): The neothelid’s innate spellcasting ability is Wisdom (spell save DC 18). It can innately cast the following spells, requiring no components:
At will: levitate
1/day each: confusion, feeblemind, telekinesis
Magic Resistance. The neothelid has advantage on saving throws against spells and other magical effects.
Multiattack. The hydra makes as many bite attacks as it has heads.
Bite. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 17 (2d10 + 6) piercing damage.
Acid Breath (Recharge 5–6). The neothelid exhales acid in a 60-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 56 (16d6) acid damage on a failed save, or half as much damage on a successful one.
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